\Header{calcium}{Calcium Uptake Data}
\keyword{datasets}{calcium}
\begin{Description}\relax
The \code{calcium} data frame has 27 rows and 2 columns.


Howard Grimes from the Botany Department, North Carolina State University,
conducted an experiment for biochemical analysis of intracellular storage
and transport of calcium across plasma membrane.  Cells were
suspended in a solution of radioactive calcium for a certain length of time and
then the amount of radioactive calcium that was absorbed by the cells was
measured.  The experiment was repeated independently with 9 different
times of suspension each replicated 3 times.\end{Description}
\begin{Usage}
\begin{verbatim}
data(calcium)
\end{verbatim}
\end{Usage}
\begin{Format}\relax
This data frame contains the following columns:


\describe{
\item[\code{time}] The time (in minutes) that the cells were suspended in the solution.

\item[\code{cal}] The amount of calcium uptake (nmoles/mg).
}\end{Format}
\begin{Source}\relax
The data were obtained from


Rawlings, J.O. (1988) \emph{Applied Regression Analysis}. 
Wadsworth and Brooks/Cole Statistics/Probability Series.\end{Source}
\begin{References}\relax
Davison, A.C. and Hinkley, D.V. (1997) 
\emph{Bootstrap Methods and Their Application}. Cambridge University Press.\end{References}

